config.mk: remove -lc

Thanks quinq!

POSIX/quinq says:

"In the absence of options that inhibit invocation of the link editor, such as
-c or -E, the c99 utility shall cause the equivalent of a -l c option to be
passed to the link editor after the last pathname operand or -l option, causing
it to be searched after all other object files and libraries are loaded."

config.mk

@@ -12,7 +12,7 @@ GITLIB = /usr/local/lib
 
 # includes and libs
 INCS = -I${GITINC}
-LIBS = -L${GITLIB} -lgit2 -lc
+LIBS = -L${GITLIB} -lgit2
 
 # debug
 #CFLAGS = -fstack-protector-all -O0 -g -std=c99 -Wall -Wextra -pedantic ${INCS}